Printing the parts

As previously mentioned, it is recommended to print the BBox parts with ABS or ASA filament. This should be done with an enclosed printer when possible. However it may be possible to print the parts in open air using some brands of ASA if you don't have drafts (or can rig up a simple draft shield).

If you decide not to enclose your BBox then it should be possible to print the parts with PLA. During the early prototype stages of development I made many versions of the parts using PLA and they seemed to be okay. The only area of concern I would have is that the motor mounts will deform when the motors get hot. To prevent that you can dial down the run current so they don't get warm, but that will affect performance and possibly quality. It may be possible to print (just these) parts in PETG for their higher heat tolerance but I've heard that PETG can deform over time due to load/stress. I don't know if that would occur or not.

Profile settings

Generally I like to print fast so I can test out my parts. This led me to using the following printing parameters when I developed the BBox parts. They gave me the strength I needed and also shortened the print times by a little compared to using Voron style print settings. So think of these as minimum settings; you can add more layers/walls or increase the infill, etc.

0.2mm layer height
0.5mm line width
4 walls, 4 top layers, 4 bottom layers
15% infill density
No supports needed

You can also use the Voron style print settings which are similar:

0.2mm layer height
Forced 0.4mm extrusion width
4 walls, 5 layers for top, 5 layers for bottom
40% infill
No supports needed

Or you could go the opposite direction and use a 0.25mm layer height for some parts to shorten the print time. Do what makes you happy.

Choosing which STL files to print

You'll need to decide if you'll be using the linear rod or linear rail variant of the BBox. The stl files for both variants can be found in separate folders. So you can ignore the folders that don't apply.

Similarly, you can choose between the axle driven dual-belted Z-drive or the dual leadscrew Z-drive. The parts for these two variants will also be in their respective folders. So only print the parts that apply to your choice.

Later on in this document I'll list out the folder names, the list of .stl files in the folder, and what the parts are used for. This way you can decide which folder(s) to use and which to ignore as well as the orientation of the parts when printing.

Note: Some of the .stl files are meant to be printed more than once. These parts will have a suffix in their name like ZBearingClamp_x3.stl. In this example the _x3 means you'll need to print 3 copies of this part.

Printed parts used for a BBox235 that uses linear rods for X axis

Build plate pics

The following section shows the print orientation you should use for each part. The arrangement of some of the parts in these build plates were adjusted to make things easier to see and may not be the best arrangement for printing.

The build plates show the .stl parts for a specific folder. The folder name and the list of .stl part files within it are listed before each build plate.

Folder: XYMotion/MotorAssembly

Always print this. Used by all variants of the BBox

MotorAssemblyLeft.stl
MotorAssemblyRight.stl
MotorAssemblyRodClamp_x2.stl
PulleySpacer_x2.stl

Folder: XYMotion/FrontIdlers

Always print this. Used by all variants of the BBox. These are the front idlers of the CoreXY motion system.

FrontIdlerLeftLower.stl
FrontIdlerLeftUpper.stl
FrontIdlerRightLower.stl
FrontIdlerRightUpper.stl

Folder: Toolhead

Always print this. Used by all variants of the BBox. These parts comprise the toolhead.

Folder: XYMotion/XRod/Joiners

These parts should only be printed if you're using the linear rods for x-axis variant. These parts form the section of the gantry that join the X-axis to slide along the Y-axis.

EndStopBumperLeft.stl
EndStopBumperRight.stl
PulleySpacer_x2.stl
XYJoinerXRodBottomLeft.stl
XYJoinerXRodBottomRight.stl
XYJoinerXRodLeft.stl
XYJoinerXRodRight.stl
XYJoinerXRodTopLeft.stl
XYJoinerXRodTopRight.stl

If using sensorless homing for X-axis you can skip printing EndStopBumperLeft.stl and EndStopBumperRight.stl. Otherwise you can choose to print just one of these parts depending on whether you want to home to the left side or the right side of your printer.

Folder: XYMotion/XRod/Carriage

These parts should only be printed if you're using the linear rods for x-axis variant. These pieces form the X-carriage that the toolhead will attach to.

Folders: XYMotion/XRail/Joiners and XYMotion/XRail/Carriage_Basic

These parts should only be printed if you're using the MGN12C linear rail for x-axis variant.

The parts in XYMotion/XRail/Joiners form the section of the gantry that join the X-axis to slide along the Y-axis.
There are two sizes available; a +70mm variant and a +75mm variant. Choose the size that matches your desired horizontal extrusion length. For example if you're building a BBox180 using a 225mm rail and you want to use 300mm extrusion then use the +75mm parts listed below instead of the +70mm versions.

XYJoinerLeft_75.stl
XYJoinerRight_75.stl

As another example, say you want to build a BBox using a 250mm rail and want to use pre-cut 320mm extrusion, then you would use the following parts instead:

XYJoinerLeft_70.stl
XYJoinerRight_70.stl

The parts in XYMotion/XRail/Carriage_Basic form the X-carriage that the toolhead will attach to.

Note: There is also an XYMoton/XRail/Carriage_DragonBurner folder with carriage parts that may work with Voron DragonBurner toolhead. These are still a work in progress and have only been briefly tested.

Folder: XYMotion/EndStopY

This folder contains three different versions of an endstop mount for the Y axis. This is not needed if you will be using sensorless homing.

EndStopY_Flat.stl
EndStopY_Left.stl
EndSotpY_Right.stl

No picture of a buildplate is provided as print orientation should be apparent and also you will only need to print one of these parts.

Choose EndStopY_Flat.stl if you're using linear rods for X-axis. You can use this part to mount an endstop switch on either the left or right side of the printer.

If using linear rail for X-axis then choose either EndStopY_Left.stl or EndStopY_Right.stl to mount the endstop depending on which side you prefer to mount your switch.

Folder: ZDrive_Belted/AxleDrive

These parts should only be printed if you're using the dual-belted Z-drive variant.

AxleBearingSupport_x2.stl
Z_Motor_Mount.stl
ZIdlerPulley_x2.stl

Folder: ZDrive_Platform

Always print this. Used by all BBox variants. The corner clamp parts are used to form the T platform while the other parts are used to support the motion of that platform up and down the Z axis. The printer bed will mount onto this T platform.

CornerClamp_40mm_x2.stl
ZBearingClamp_x3.stl
ZRodClampAligned_x6.stl
ZSwitchMountOneSided.stl
ZSwitchPlate.stl

Folder: ZDrive_Belted/Clamps

These parts should only be printed if you're building the dual-belted Z-drive variant. These are the parts that clamp the ends of each belt and the mounts that attach the clamp the T platform.

ClampMountParallel_Heatsets.stl
ClampMountParallel_SquareNuts.stl
ClampMountPerpendicular.stl
SlidingClamp_Parallel.stl
SlidingClamp_Perpendicular.stl
StationaryClamp_Parallel.stl
StationaryClamp_Perpendicular.stl

Folder: ZDrive_LeadScrew

These parts should only be printed if you're building the dual leadscrew variant

LeadScrewNutMount.stl
LeadScrewNutMountOffset.stl
ZMotorMount_x2.stl

Folder: Toolhead - BambuX1_V6.stl only

Always print this part. It is used by all variants of the BBox. This part is used to adapt a clone Bambu Labs X1C hotend to the V6 (J-Head) hotend mount. This is the only part where supports (on build plate only) are recommended. If you print very slow you might not need the supports. You will want to prevent supports from being generated in/around the "block" area of the adapter.

BambuX1_V6.stl