Top spool holder
This page is divided in three sections:
Filament guide
You have here 3 options, depending on your enclosure.
A- Simple filament’s guide
Files in 14B_Top_Spool_Holder:
14B_For_PB_simple_filament_guide
or
14B_For_PB2_top_filament_guide_hole
Assemble the filament guide to the top of the printer-box with 4 M3x6mm screws (screw heads on the outside). There is no need for nuts: this part of the printer-box will not be subject to any pressure.
B- Chimney filament’s guide
STL files in “14B_Top_Spool_Holder” folder:
PrusaBox-2:
- 14B_For_PB2_top_filament_guide_base
- and one of the top part you want: 14B_For_PB2_top_filament_guide_xxx
PrusaBox:
- PB_filament_chimney_base
- and one the top part you want :PB_filament_door_top_xxxx
The filament chimney is assembled with 6 M3 screws and nuts.
Move the extruder to each side to make sure that the filament is moving correctly.
If not, make sure that:
- The filament is sliding freely in the PTFE tube
- The PTFE tube is only 1cm in the top part of the chimney.
C- No filament’s guide (PrusaBox-2)
STL files in “14B_Top_Spool_Holder” folder:
- 14B_For_PB2_top_filament_no_hole
If you don’t want to use any top spool holder, print this file to seal the top slot.
Top Spool holder for Prusa
Files for PrusaBox-2 coming soon
This mod uses the Prusa mk3s genuine spool holder and
adds a filament chimney to reduce filament friction.
Assembly time: 10 min
- M3 screws and nuts
- Prusa genuine double spool holder or printed here
Mount your Caribou spool holder on this parts, screwed to the top of your ModularBox.
STL file in “14B_Top_Spool_Holder” folder:
- PB_top_prusa_spool_mount
Step 1 Assemble the spool holder
Step 2 Assemble to the metal frame
Top Spool holder for Caribou
Only for PrusaBox-2
This mod uses the Prusa mk3s genuine spool holder and
adds a filament chimney to reduce filament friction.
Assembly time: 10 min
Mount your Caribou spool holder on this parts, screwed to the top of your ModularBox.
STL file in “14B_Top_Spool_Holder” folder:
- 14B_For_PB2_top_spool_holder_Caribou_mount
Spool holder itself is the one from Caribou3D, available here
Step 1 Prepare the spool holder
Assemble your spool holder with the given hardware. Use section’s nuts to assemble the spool holder to its base.
Step 2 Assembly
Assemble the spool holder to the metal frame using crossbeam’s M4 screws and nuts.
Assemble then the chimney with M3*6 screw, that will allow to guide filament with less friction.




