Original Prusa I3 MK2 Manual

							 
 
Both the assembled versi on a nd th e ki t ve rsion co me  w it h  a  fe w  th in gs  yo u m ig ht n eed
 
during the printer use.  
 
- USB Cable ​ - used fo r  uplo adin g a  n ew  firmw are  o r  alt e rn ative ly  prin tin g fr o m  th e
 
computer.  
- Acupuncture needle
​ -  use d fo r  cl eanin g th e n ozzl e w hen st uck.  S ee th e ch apte r
 
11.3 Nozzle cleaning
​ fo r  mo re in fo rma tio n.
 
- Glue stick ​ - Used fo r  bette r  N ylon a dhesi on o r  as  a se para to r fo r F le x  m ate ria ls.  S ee
 
the chapter  ​10 Materia ls
​ fo r  mo re in fo rma tio n.
 
- Test protocol  ​- All  th e co mp onents  of e ve ry  prin te r  are  te st ed. T he e le ct ro nic  parts
 
are even connected a s  in  a  fin al  a sse mbly  and b atte ry  of te st s is  ra n. O nly  when a ll
 
tests pass the electronics  get a  se ria l  n umb er  and p ro to co l  +  S/N  st icke rs  are  p rin te d.
 
Test protocol shows  all  th e te st  re su lt s  of yo ur  prin te r  co mponents.
 
6.2 Printer assembly  
 
With Original Prusa i3  MK2  
​prin te r
​ ki t w e su ggest  to  fo llo w  th e g uid elin es  and
 
assemble the kit accordin g to  th e th e 
​onlin e
​ ma nual  a t 
​manual. p ru sa 3d.co m
​. (
​ Onlin e
 
manual is available in  se veral  la nguages  on th e w ebsi te ). T he co nst ru ct io n o f th e
 
printer ​ should not ta ke  mo re th an o ne w orki ng d ay.  Af te r  a su cce ssful  co mple tio n
 
continue to the chapter  ​6.3 Se tu p b efo re  p rin tin g
​.  
6.3 Setup before prin ting
 
 
● Place the  ​printer ​ to  a  h orizo nta lly  stable  p osi tio n, b est  p la ce  is  a w orkb ench  w here
 
there is no risk of  ​dra ft
​.  
● Attach the  ​filament
​  h old ers  to  th e u pper  fra me .
 
● Attach  ​Filament ​ to th e h old ers.  Ma ke su re th e 
​fila me nt
​ sp ool  d oesn ’t  ja m  a nd ca n
 
move freely.  
● Plug in the AC power  co rd, ch eck  to  ma ke su re th e p ro per se ttin g fo r A C  vo lt a ge is
 
selected (110V/220V)  and tu rn  o n th e sw it ch .
 
● Check out the firmware  ve rsion (i n  th e Su pport  me nu vi a L C D p anel)  a nd if  it ’s  old er
 
than 3.0.9, please u pgra de to  th e la te st  o ne fro m  our  w ebsi te  -
 
http://www.prusa3d.co m/ drive rs/
​ o th erw ise  yo u w on’t  b e a ble  to  fo llo w  o ur n ew
 
calibration flow.    
 
Filament  ​is a common 
​te rm
​ fo r  th e 
​pla sti c r o d 
​-  ​mate ria l
​ p ro vi ded o n a  sp ool  fr o m
 
which 3D objects are p rin te d.
   
 
11
  
						

							 
6.3.1 Calibration flow  
 
 
12
  
						

							 
There are few special occ asi ons  where  yo u w ill  n eed to  re do th e ca lib ra tio n o r p art o f it .
 
 
● Firmware update ​ -  C omp le te  g uid e is  in  th e ch apte r 
​11.8  U pdatin g p rin te r fir m ware
​.  
6.3.9. First layer calib ra tio n
​ n eeds  to  b e re run o th erw ise  th e p rin te r w ill  sh ow  a n e rro r
 
message.    
● Replacing the PEI/U lte m s h eet
​  -  W hen PEI  is  ch anged ( g uid e is  at
 
manual.prusa3d.com
​), w hole  h eate d b ed is  re mo ved a nd r e asse mble d. T his  m ig ht
 
change geometry o f th e p rin te r  and th e w hole  
​KIT  c alib ra tio n f lo w
​ sh ould  b e
 
followed even on the p re  a sse mble d p rin te r.
 
● Readjusting the P.I.N .D .A . p ro be
​ -  R un 
​6.3 .6  C alib ra te  Z
​ to  st ore  n ew  r e fe re nce  Z
 
height values.  
 
It is important to d isco nnect  th e p rin te r  U SB  fro m  any  co mpute r o r O ctoP rin t r u nnin g
 
on RaspberryPi for  th e w hole  ca lib ra tio n. Pri nte r  w ill  n ot r e sp ond to  a ny  re quest
 
from the host and co mmu nica tio n w ill  time out, w hen h ost  r e se ts  th e co nnect io n, th e
 
printer restarts and mi ght e nd u p in  w eird  st ate  re quiri n g 
​7.2 .3 .2  F ull  F act ory  Rese t
​.  
 
6.3.2 PEI print surface preparation  
 
To achieve the best adhe sion o n th e n ew  su rface , it  is  imp ort ant to  ke ep th e su rfa ce  cl ean.
 
Cleaning of the surface is  very  easy.  T he b est  o ptio n is 
​Is o pro pyl a lc o hol 
​ava ila ble  in
 
drugstores which is the b est  fo r  ABS,  PL A and o th ers  (exce pt fo r P E TG  w here  th e a dhesi on
 
may be too strong. See the  ch apte r 
​10.3  PET
​ fo r  in st ru ctio ns).  P our a  lit tle  a m ount o n
 
unscented paper towel an d w ip e th e p rin t su rface . T he b ed sh ould  b e cl eaned w hile  co ld  fo r
 
the best results but it can  also  b e cl eaned w hen a lre ady  pre heate d fo r P LA , ju st  b e ca re fu l
 
not to touch the bed surfa ce o r  th e n ozzl e. W hen cl eanin g a t h ig her te m pera tu re s  th e a lco hol
 
will evaporate before it ca n cl ean a nyt hin g. Al te rn ative ly,  yo u ca n cl ean th e b ed w it h  
​warm
 
water and a few drops o f a d is h  s o ap
​ o n a  p aper  to w el.  
​Den atu re d  a lc o hol
​ is  ye t a noth er
 
option.    
 
The surface does not h ave  to  b e cl eaned b efo re  e ve ry  prin t! It is  ju st  im porta nt to  
​not
 
touch ​ the print bed w it h  
​yo ur h an ds
​ o r 
​dir ty  to ols
​ . 
​ Cle an  y o ur t o ols  w it h  t h e s am e
 
solution ​ as you would  th e b ed a nd yo u w ill  b e a ble  to  st art yo ur n ext  p rin t r ig ht a w ay.
 
 
You can leave small marks  on th e p rin t su rface  w it h  yo ur  nozzl e o r to ols,  th ey  will  typ ica lly
 
be shinier than the rest. I t d oes  not a ffe ct  th e fu nct io nalit y  or  adhesi on. H ow eve r, if  yo u w ant
 
to have same surface look  on th e w hole  p rin tb ed yo u ca n re su rface  it . T he e asi est  w ay  is  to
 
take a hard side of dry kit chen sp onge a nd w ip e th e a ffe ct ed a re a w it h  ci rcu la r m otio n g ently
 
few times.  
 
The industrial glue w hich  h old s  th e PEI  sh eet o n th e h eatb ed it se lf  so fte ns  when
 
temperatures greate r  th an 1 10 ° C  a re  u se d. If h ig her  te m pera tu re s  are  u se d, th e
 
glue can migrate under  th e PEI  a nd cre ate  sl ig ht b ump s on th e su rfa ce .
 
6.3.3 Increasing the adhesion  
 
In some special occasion s, like  a  ta ll  o bje ct  w it h  a  ve ry  sma ll  co nta ct  a re a w it h  th e p rin t
 
surface, you might need  to  in cre ase  th e a dhesi on. F ort unate ly  PEI  is  a ve ry  ch em ica lly
 
13
  
						

							 
resistant polymer and you  can te mp ora ry  apply  oth er  adhesi on so lu tio ns  wit h out d am agin g
 
it. This also applies to ma te ria ls  which  w ould  n ot st ick  to  PEI  o th erw ise , like  N ylon e tc.
 
 
Before applying anything  to  th e b ed, co nsi der  usi ng 
​Brim  o ption
​ in  S lic3 r w hich  in cr ease s
 
the surface area of the first  la ye r.
 
 
For PLA and Nylon blend s a si mp le  g lu e st ick  does  th e tri ck.  G lu e ca n b e la te r e asi ly
 
removed by window clea ner  or  dish  so ap w ate r.
 
 
For ABS prints, ABS juice  ca n b e u se d a nd la te r  cl eaned w it h  p ure  a ce to ne. B e ve ry  gentle
 
when applying the juice a nd d o so  w hile  th e b ed is  co ld . Pri nts  will  a tta ch  ve ry  stro ngly.
 
 
Prepared  ​juice ​ can b e a lso  p urch ase d in  o ur  e-sh op. U nfo rtu nate ly,  U PS se rvi ce
 
does not allow to delive r any  ace to ne-b ase d p ro duct s due to  sh ip pin g co nst ra in ts.  In
 
that case you get only  th e b ottle  a nd ABS  fro m  our  e-sh op a nd yo u h ave  to  so urce
 
the acetone locally.    
 
6.3.4 Selftest  ​(kit only)
 
 
The purpose of the selftest  ro utin e is  to  ch eck  mo st co mmo n e rro rs  when a sse mblin g a nd
 
connecting electronics an d to  h elp  in dica te  a ny  possi ble  e rro rs afte r a sse mbly.  Y ou ca n r u n
 
the  ​Selftest  ​from  ​Calibration 
​menu o n L C D p anel.  T his  sh ould  n ot b e n ece ssa ry  on th e
 
assembled printers as those  a re  p re te st ed.
 
 
Initiating this routine performs  a se rie s  of te st s. T he p ro gre ss  and r e su lt s  of e ach  st ep a re
 
displayed on the LCD. In  case o f e rro rs fo und, th e se lf te st  is  in te rru pte d a nd th e r e aso n fo r
 
error is shown to guide use rs in  tro uble sh ootin g.
   
 
Test consists of    
Extruder and print fa n
​ te st  (si nce  firmw are  ve rsion 3 .0 .9 )
 
Heatbed ​ and  ​hoten d
​ p ro per  w iri n g
 
XYZ motors ​ proper  w iri n g a nd fu nct io nalit y
 
XYZ endstop ​ mechanica l  se ttin gs  and p ro per  w iri n g.
 
 
6.3.4.1 Selftest error me ssage s an d re so lu tio n (k it  on ly)
 
 
Fan - Wiring error:    
Check proper wiring o f p rin t a nd h ote nd fa n ca ble s.  En sure  th at b oth  a re  p ro perly
 
connected to the Ramb o e le ct ro nics,  a nd th at th ey  are  n ot sw apped.
 
 
Heater/Thermistor - Not co nnect ed:
   
Check proper wiring o f h ot e nd p ow er  ca ble s  and th ermi stor ca ble s.  E nsu re  th at b oth
 
are properly connected to  th e R amb o e le ct ro nics,  a nd th at th ey  are  n ot sw apped.
 
 
Bed/Heater - Wiring error:    
Check that heatbed a nd h ote nd p ow er  ca ble s  are  n ot sw apped o r th erm ist or ca ble s
 
from both hotend and h eatb ed a re  n ot sw apped in  th e R am bo e le ct ro nics.
 
14
  
						

							 
 
Endstops - Wiring error -  {XYZ}:
   
Check the proper cablin g o f e ndst ops.  R outin e in dica te s  axi s  on w hich  e ndst op
 
reported malfunctio n o r  is  not p ro perly  re sp ondin g. C heck  th e p ro per co nnect io n in
 
the Rambo electronics.
 
 
Motor - {XYZ} - Endstop {XYZ }:
   
Check that motor and e ndst op o n in dica te d a xi s  are  p ro perly  co nnect ed to  th e
 
Rambo electronics and n ot sw apped w it h  mo to r  or  endst op o f d if fe re nt a xi s.  A xi s
 
causing the problems is  in dica te d o n th e L C D p anel.
 
 
Endstop not hit - Motor {X ZY}:
   
Check mechanical se ttin gs  th at e ndst op ca n b e re ach ed w hen a xi s  is  in  m in im al
 
position.  
 
6.3.5 Calibrate XYZ  ​(kit on ly )
 
 
The Original Prusa i3  MK2  co me s wit h  a  fu ll  me sh b ed le ve lin g fe atu re , h ow eve r
 
for this to work we n eed to  first  ca lib ra te  th e d ist ance  b etw een tip  o f th e n ozzl e
 
and P.I.N.D.A ( ​P ​rusa  
​IN D
​uct io n 
​A ​uto le ve lin g)  pro be.
 
The process is fa irl y  stra ig htfo rw ard , so  le t’s  get to  it . W e a lso  su ggest  to  ch eck
 
out our Guide for New Us er  first  a t 
​ww w.p ru sa 3d.co m/ build vi deom k2
​ w it h  ca lib ra tio n tip s.
 
 
The purpose of the X/Y/Z  calib ra tio n ro utin e is  to  me asu re th e ske w o f th e X /Y /Z  a xe s and to
 
find the position of the 9 ca lib ra tio n p oin ts  on th e p rin t b ed fo r  th e p ro per b ed le ve lin g. Y ou
 
can run the  ​XYZ calibratio n
​  ​fro m 
​ Calib ra ti on 
​​menu o n L C D p anel.  T his  sh ould  n ot b e
 
necessary on the assemb le d p rin te rs  as  th ose  a re  fa ct ory  calib ra te d. 
​Be su re  yo u’r e  u si ng
 
the firmware version 3.0. 9 o r  th e la te st !
 
 
Place a sheet of a re gula r  office  p aper  (for  exa mp le  th e ch eckl ist
 
shipped with every ord er)  and h old  it  u nder  th e n ozzl e d urin g th e fir st
 
round (first 4 points  bein g ch ecke d)  of ca lib ra tio n. If th e n ozzl e ca tch es
 
on the paper during  th e p ro ce ss,  p ow er  off th e p rin te r a nd lo w er th e
 
P.I.N.D.A. probe slig htly.  Se e th e P. I.N .D .A.  p ro be r e sp onse  d ia gra m  in
 
6.3.10.2 Check prob e h eig ht
​. T he p aper  w ill  n ot a ffe ct  th e ca lib ra tio n
 
process. The nozzle  mu st n ot to uch  th e p rin t su rface  o r d efle ct  th e b ed
 
by any means. If eve rythin g w ent co rre ctly,  tig hte n th e b otto m  n ut o f th e
 
probe or it can get lo ose  d urin g p rin tin g la te r!
   
 
Initiating this routine performs  a se rie s  of me asu reme nts  in  th re e r o unds:  In  th e fir st  r o und, 4
 
sensor points on the print  b ed a re  se arch ed fo r  ca refu lly  as  to  n ot to uch  th e p rin t b ed b y  th e
 
nozzle. In the second roun d, a ll  9  se nso r poin ts  are  fo und. In  th e la st  r o und th e h eig ht a bove
 
15
  
						

							 
the 9 sensor points is me asu red a nd st ore d in to  a  n on-vo la tile  m em ory  fo r r e fe re nce , th is
 
finished the Z axis calibrat io n.
 
 
The progress and results  o f e ach  st ep a re  d isp la ye d o n th e L C D. In  ca se o f e rro rs  fo und, th e
 
XYZ calibration is interrupt ed a nd th e re aso n fo r  erro r is  sh ow n to  g uid e in  tr o uble sh ootin g.
 
 
At the start of the XYZ cal ib ra tio n p ro ce dure  th e p rin te r  pro mp ts  yo u b y  a fo llo w in g m essa ge:
 
"Calibrating X/Y. Move  Z c arria g e u p to  th e e n d s to ppers . C lic k w hen  d one.”
 
 
After that, the printer ask s yo u to  co nfirm  th is  step: 
​"A re  le ft  an d r ig ht Z  c arria g es a ll u p?"
 
 
Please make sure you re ally  mo ve th e Z  ca rriage u p to  th e e nd st oppers  until  yo u h ear a
 
rattling sound as the Z ste pper  mo to rs  ski p st eps.  T his  pro ce dure  e nsu re s,  th at 1 ) th e X  a xi s
 
is perfectly horizontal, 2)  th e p rin t n ozzl e is  in  a  kn ow n d ist ance  fr o m  th e p rin t b ed. In  ca se
 
the Z carriage did  ​not  ​touch th e e nd st oppers,  th e p rin te r  co uld  n ot p ossi bly  kn ow  th e h eig ht
 
of the print nozzle above t he p rin t b ed a nd it  co uld  th ere fo re  cra sh in to  th e p rin t b ed d urin g
 
the first round of the X/Y ca lib ra tio n p ro ce dure .
 
 
The XYZ calibration proce dure  a lso  p ro mp ts  yo u to  
​"Pl ease c le an  t h e n ozzl e f o r
 
calibration. Click when  done."
 
 
If this advice is not followe d a nd th ere  is  a p la st ic  debris  on th e p rin t n ozzl e, th en th e d ebris
 
may touch the print bed o r eve n p ush  th e p rin t b ed a w ay  fro m  th e P IN DA p ro be, so  th e
 
PINDA probe will not trigge r pro perly  and th e ca lib ra tio n w ill  fa il.
 
 
6.3.5.1 Calibrate XYZ e ​rror me ssa ges  and re so lu tio n 
​(kit  on ly)
 
 
1) XYZ calibration faile d . B ed  c alib ra ti on p oin t w as n ot fo und.
 
 
Calibration routine d id  n ot fin d a  b ed se nso r poin t. T he p rin te r st ops  close  to  th e b ed
 
point, which it failed to  d ete ct . Pl ease  ve rify,  th at th e p rin te r is  asse mble d co rre ct ly,
 
that all axes move fre ely,  th e p ulle ys  do n ot sl ip  a nd th e p rin t n ozzl e is  clean. If
 
everything looks good, re -ru n th e X/ Y ca lib ra tio n a nd ve rify  wit h  a  sh eet o f p aper
 
between the nozzle a nd th e p rin t b ed th at th e p rin t n ozzl e d oes  not to uch  th e p rin t
 
bed during the calib ra tio n ro utin e. If yo u fe el  a  fri ct io n o f th e n ozzl e a gain st  th e sh eet
 
of paper and the nozzl e is  clean, yo u n eed to  scre w th e P IN DA p ro be sl ig htly  lo w er
 
and re-run the X/Y ca lib ra tio n.
 
 
2) XYZ calibration faile d . Pl ease c o nsu lt  th e m an ual.
 
 
The calibration points  were  fo und in  p osi tio ns  fa r  fro m  what sh ould  b e e xp ect ed fo r a
 
properly assembled p rin te r.  Pl ease  fo llo w  th e in st ru ctio ns  of ca se 1 ).
 
 
3) XYZ calibration ok. X/ Y axes a re  p erp en dic u la r.
 
 
16
  
						

							 
Congratulations, you b uilt  yo ur  prin te r  pre cise ly,  yo ur  X/ Y a xe s are  p erp endicu la r.
 
 
4) XYZ calibration all r ig ht. X/ Y axes a re  s lig htly s kew ed .
 
 
Good job, the X/Y a xe s are  n ot p re cise ly  perp endicu la r,  b ut st ill  q uit e  a ll  r ig ht. T he
 
firmware will correct fo r  th e X/ Y ske w d urin g n orma l  p rin tin g, so  b oxe s will  b e p rin te d
 
with right angles.  
 
5) X/Y skewed severe ly . Sk ew  w ill b e c o rre cte d a u to matic ally .
 
 
You may consider to  re -alig n th e X/ Y axe s (a s descri bed in  th e ch apte r 
​6.3.5.1 Y
 
axis alignment ​) ​. St ill  th e firmw are  w ill  co rre ct th e ske w d urin g n orm al  p rin tin g a nd a s
 
long as the X and Y  axe s mo ve fre ely,  th e p rin te r  w ill  p rin t co rre ct ly.
 
 
6) XYZ calibration faile d . L eft  front calib ra ti on p oin t not re ach ab le .
 
 
Even if the printer mo ves th e p rin t b ed to  th e e nd Y  end st op, th e P IN DA p ro be
 
cannot reach the left fro nt b ed ca lib ra tio n p oin t. Mo ve th e le ft Y  th re aded r o d in  th e Z
 
frame away from you, so  th e PI NDA  pro be re ach es  th e le ft fr o nt b ed ca lib ra tio n p oin t
 
reliably.  ​You can fin d ho w to  f ix  thi s in  the  n ext  cha pte r 
​ 6.3.5.1 Y ax is
 
alignment ​.  
 
7) XYZ calibration faile d . R ig ht fr ont calib ra ti on p oin t not r e ach ab le .
 
 
Even if the printer mo ves th e p rin t b ed to  th e e nd Y  end st op, th e P IN DA p ro be
 
cannot reach the right fro nt b ed ca lib ra tio n p oin t. Mo ve th e r ig ht Y  th re aded r o d in  th e
 
Z frame away from you, so  th e PI NDA  pro be re ach es  th e r ig ht fr o nt b ed ca lib ra tio n
 
point reliably.  ​You ca n f in d o ut  how to  f ix  thi s in  the  n ext  ch ap te r 
​ 6.3.5.1 Y ax is
 
alignment ​.  
 
8) XYZ calibration faile d . F ro nt calib ra ti on p oin ts  n ot re ach ab le .
 
 
Even if the printer mo ves th e ta ble  to  th e e nd Y  end st op, th e P IN DA p ro be ca nnot
 
reach the front row o f th e b ed ca lib ra tio n p oin ts.  Mo ve b oth  le ft / r ig ht Y  th re aded
 
rods in the Z frame a w ay  fro m  you. 
​You ca n f in d o ut  how to  f ix  th is  in  th e n ext
 
chapter  ​6.3.5.1 Y ax is  ali gn me nt
​.  
 
9) XYZ calibration compro m is ed . L eft  front calib ra ti on p oin t n ot r e ach ab le .
 
XYZ calibration compro m is ed . R ig ht fr ont calib ra ti on p oin t n ot r e ach ab le .
 
XYZ calibration compro m is ed . F ro nt calib ra ti on p oin ts  n ot r e ach ab le .
 
 
Printer will likely work, b ut th e b ed le ve lin g ma y be co mp ro m ise d a nd th e ske w o f th e
 
X/Y axes may not be fu lly  co rre cted. It is  re co mme nded to  a dju st  th e p osi tio ns  of th e
 
Y threaded rods in th e Z  fra me  a s  in  ca ses 6)  to  8 ).  
​ You ca n f in d o u t  how  to  f ix  th is
 
in the next chapter 
​ 6.3.5.1 Y ax is  ali gn me nt
​.  
 
17
  
						

							 
During the mesh bed level in g p ro ce dure  fo llo w in g e rro rs ma y be r e porte d o n th e d isp la y.
 
 
1) Bed leveling failed. Se nso r d is co nnecte d o r c ab le  b ro ken . W ait in g f o r r e set.
 
 
Verify, whether the PI NDA  pro be ca ble  is  plu gged in to  th e R AM Bo b oard  co rre ct ly.  If
 
it is the case, the PINDA  pro be is  bro ke n a nd it  n eeds  to  b e r e pla ce d.
 
 
2) Bed leveling failed. Se nso r d id n’t  tr ig ger. D eb ris  o n n ozzl e?  W ait in g f o r r e set.
 
 
This is a safety check to  a vo id  th e n ozzl e to  cra sh in to  th e p rin t b ed if  th e P IN DA
 
sensor stops working o r  so me th in g g oes  wro ng w it h  th e p rin te r m ech anics  (fo r
 
example, a pulley slip s).  T his  sa fe ty  ch eck  ma y be tri g gere d a s  well,  if  th e p rin te r h as
 
been moved to an uneve n su rface . Be fo re  d oin g a nyt hin g e lse , m ake  th e Z  a xi s  le ve l
 
by going all the way  up a nd try  again .
 
 
At the end of the X/Y  ca lib ra tio n, th e p rin te r  me asu res th e r e fe re nce  h eig ht a bove
 
each of the 9 bed senso r poin ts  and st ore s th e re fe re nce  h eig hts  in to  a  n on-vo la tile
 
memory. During the n orma l  b ed le ve lin g, it  is  exp ect ed th at th e P IN DA p ro be tr ig gers
 
not further than 1 mm fro m  th e re fe re nce  va lu e, th ere fo re  th e n ozzl e is  not a llo w ed to
 
move more than 1 mm belo w  th e re fe re nce  va lu e d urin g th e b ed ca lib ra tio n.
 
 
If you moved the prin te r,  yo u ma y need to  re -ru n th e Z  ca lib ra tio n to  sa mple  n ew
 
reference Z height va lu es  re fle ct in g th e tw ist  a nd b end o f th e ta ble  su rfa ce  th e p rin te r
 
is sitting on. If that d oes  not h elp , p le ase  ve rify,  th at th e P IN DA p ro be is  alig ned w it h
 
the sensor points on th e p rin t b ed d urin g th e b ed Z  ca lib ra tio n. T he a lig nm ent sh all
 
be ensured by the auto ma tic  X/ Y ca lib ra tio n ro utin e. If th e P IN DA p ro be is  no m ore
 
aligned during the Z  ca lib ra tio n o ve r time , it  is  possi ble , th at a  p ulle y  is  slip pin g o r
 
something on the machin e fra me  g ot lo ose .
 
 
3) Bed leveling failed. Se nso r tr ig gere d  to o h ig h. W aiti ng f o r r e set.
 
 
Similar to case 2). T his  time  th e PI NDA  se nso r tri g gere d m ore  th an 1  m m a bove  th e
 
reference height. Befo re  d oin g a nyt hin g e lse , ma ke th e Z  a xi s  le ve l  b y  goin g a ll  th e
 
way up and try again .
 
 
 
   
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6.3.5.1 Y axis alignmen t (ki t on ly )
 
 
For autocalibratio n to  w ork  pro perly,  it  is  ext re me ly  imp orta nt fo r th e Y  a xi s  to  b e
 
perpendicular to th e X  axi s.  T his  ca n b e e asi ly  ch ecke d b y  lo oki ng a t th e p rin te r
 
from the top and vi su ally  alig nin g th e X-a xis  ro ds  wit h  lin es  on th e h eatb ed. If th e Y
 
axis is misaligned, yo u ca n e asi ly  adju st  th e p osi tio n o f th e Y  a xi s  in si de th e fr a m e
 
by loosening the  ​M10 nuts ​ o n th e Y  axi s  and se curin g th em  at th e n ew ly  adju st ed p osi tio n.
 
You can see how in the  ​Assem bly  Ma nual 7 .PSU /Ste p 1 8
​ o r  in  P .I.N .D .A . P ro be
 
Misaligned topic at  ​help.prusa 3d.co m
​.  
 
 
Pic. 5 - X-axis rods  mu st b e vi su ally  alig ned w it h  lin es  on th e h eatb ed.
   
 
If the Calibrate XYZ gives  “
​ XYZ c alib ra ti on c o m pro m is ed . F ro nt c alib ra tio n p oin ts  n ot
 
reachable. ​” error, you don’t  n ece ssa rily  need to  a dju st  th e M1 0 n uts  and p osi tio n o f th e a xi s
 
in the frame, but you can  a dju st  th e b elt  h old er  posi tio n. N ew  ve rsi on o f th e Y -b elt - h old er
 
with a slot (shipped from  August  8 , 2 016)  allo w s  to  ma ke a  1  mm  adju st m ent to  b oth  th e
 
front and the back. Loose n th e Y  belt  h old er  scre ws,  p ush  th e b elt  h old er p art to w ard s  th e Y
 
motor and retighten the s crews.
 
 
6.3.6 Calibrate Z  
 
Calibrate Z ​ is located in  ​Calib ra ti on
​ me nu. It sh ould  b e p erf orme d a fte r yo u m ove  th e
 
printer to different location . It sa ves th e h eig hts  of a ll  9  ca lib ra tio n p oin ts  in  n on-vo la tile
 
memory. Stored informat io n is  use d e ve ry  time  me sh b ed le ve llin g is  ca lle d d urin g a  p rin t.
 
When the measured value s are  va stly  dif fe re nt to  th e st ore d va lu e, p rin t is  ca nce le d a s  it  is  a
 
good indicator something  is  wro ng. C alib ra te  Z  is  a p art  o f C alib ra te  X YZ r o utin e so  th ere ’s
 
no need to run it after suc cessf ul  C alib ra te  XYZ .
 
 
It is a good practice to run  th is  pro ce dure  e ve ry  time  yo u tra ve l  o r p rin te r is  sh ip ped a s  th e
 
geometry might change s lig htly  and ca use  a n e rro r.
 
 
At the start of the Z calibr atio n p ro ce dure  th e p rin te r  pro mp ts  yo u b y  a fo llo w in g m essa ge:
 
"Calibrating Z. Move Z ca rria g e u p to  th e e n d s to ppers . C lic k w hen  d one.”
 
 
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After that, the printer ask s yo u to  co nfirm  th is  step: 
​"A re  le ft  an d r ig ht Z  c arria g es a ll u p?"
 
 
Please make sure you re ally  mo ve th e Z  ca rriage u p to  th e e nd st oppers  until  yo u h ear a
 
rattling sound as the Z ste pper  mo to rs  ski p st eps.  T his  pro ce dure  e nsu re s,  th at 1 ) th e X  a xi s
 
is perfectly horizontal, 2)  th e p rin t n ozzl e is  in  a  kn ow n d ist ance  fr o m  th e p rin t b ed. In  ca se
 
the Z carriage did  ​not  ​touch th e e nd st oppers,  th e p rin te r  co uld  n ot p ossi bly  kn ow  th e h eig ht
 
of the print nozzle above t he p rin t b ed a nd it  co uld  th ere fo re  cra sh in to  th e p rin t b ed d urin g
 
the Z calibration procedu re.
 
 
The Z calibration procedu re a lso  p ro mp ts  yo u to  
​"Pl ease c le an  t h e n ozzl e f o r c alib ra tio n.
 
Click when done."  
 
If this advice is not followe d a nd th ere  is  a p la st ic  debris  on th e p rin t n ozzl e, th en th e d ebris
 
may touch the print bed o r eve n p ush  th e p rin t b ed a w ay  fro m  th e P IN DA p ro be, so  th e
 
PINDA probe will not trigge r pro perly  and th e ca lib ra tio n w ill  fa il.
 
 
6.3.7 Mesh bed levelling  
 
Mesh bed levelling ​ can be fo und in  
​Calib ra ti on
​ me nu. It is  th e sa me p ro ce dure  w hich  is
 
performed before every p rin t. Yo u ca n u se  it  to  ch eck  th e P. I.N .D .A . p ro be a lig nm ent w it h
 
the calibration points how eve r it  is  not n ece ssa ry durin g th e ca lib ra tio n p ro ce ss  as  M esh  b ed
 
leveling is a part of Calibra te  XYZ  a nd C alib ra te  Z  ro utin es.
 
 
Before running this com man d c le an  th e n ozzl e ti p fr om  a n y d eb ris  a n d r u n it  w hile  t h e
 
nozzle is cold. If the prob e is  m is alig ned  a n d th e n ozzl e is  p re h eate d , t h e n ozzl e c an
 
make permanent impre ssio ns in  th e p rin t su rfa ce.
 
 
 
 
Pic. 6 - The probe must  b e in si de th e ci rcl es  (1 st a nd 9 th  ca lib ra tio n p oin t)  to  su cce ssfully
 
le ve l  th e b ed
​.    
 
   
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