I love my prusa mk2 and I wanted to print on glass with it, so I checked out techtiptricks video on youtube about that: https://www.youtube.com/watch?v=VQNCvE2OLhA

The gcode to do this is available on prusamk2.com: http://www.prusamk2.com/printing-on-glass-with-youre-prusa-i3-mk2-ohhh-so-smooth/

Unfortunately all my clips to hold the glass didn't work verry well and were often been pulled away by the extruder, like in techtipricks video. So I created my own clips that can be integrated into the heatbed and don't desturbe the extruder.

Heres the manual how you install them on your prusa mk2 (compare the pictures):

• unscrew all the 6 screws (2 front, 2 back, 2 middle) that hold the heatbed to the printer
• put the 4 hex-nut-pieces into the four bottom-clip-parts (FL,FR,BL,BR). Make sure that they are under the bottom-clip-parts!
• clean the top-clip parts and put some M3x16 screws through them. let them stand out a little bit like shown on the pictures
• combine all the bottom-clip-parts and the top-clip-parts exept the BL-part by screwing them together. let some space between both parts.
• put on the clips together with the already entered hex-nut-parts under the hex-nuts of the heatbed. Make sure the hex-nut-parts are NOT on top (compare pictures). the clips are labled: FL (front left), FR (front right), BL (back left), BR (back right).
• tighten all the screws to the heatbed again. ATTENTION: Make sure the white cable from under the heatbed doesn't get jammed by the BL-clip (should go right around it)!
• now put the top-clip-part and the BL-clip together with the screws.
• put the glass on the heatbed and close all clips. Then tighten all screws until the clips hold the glass tight an can be removed easely. Make shure the screws dont poke out from the top-clip parts, especially not on the FL- and the FR-parts! If they poke out to much, they can get in contact with the extruder.

GCODE: This is the gcode I use on my printer for the starting procedure. Make sure you adapt it for yours:

• G1 Z2.0 : Enter the thickness of your glass in this line of code (in this example 2.0 millimeters)
• You got 2 minutes to insert the glass (beep after the first minute)

G21 ; set units to millimeters
G90 ; use absolute positioning
M82 ; absolute extrusion mode
M104 S{material_print_temperature} ; set extruder temp
M140 S{material_bed_temperature} ; set bed temp
M190 S{material_bed_temperature} ; wait for bed temp
M109 S{material_print_temperature} ; wait for extruder temp
G92 E0.0 ; reset extruder distance position
G80 ; mesh bed leveling
G1 Y-3.0 F1000.0 ; go outside printing area
G1 F600 Z+30
G4 P30000 ; pause for 1 minute
M300 S1567 P240 ; Play a Beep
M117 One minute remaining ; One minute remaining warning
G4 P30000 ; pause 1 more minute
G1 Z2.0 ; consider glass thickness Measure your glass thickness first
G92 Z0 ; Set absolute positioning for remaining print
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0 ; reset extruder distance position

Thats it :-) Now you got a mk2 with mounted clips that are not influenced by the extruder and can be removed easely to take out the glass. Have fun! :-)