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fixed-bed-mount

About

Every 3D printer has a heated bed, so why shouldn't X-SCARA have one too?

This accessory is designed mainly for the OpenBuilds mini heated bed heaters (see picture) and it works by connecting the build plate firmly to the X-SCARA frame. This rigid connection enables you to do precise bed leveling calibration and to keep it consistent across multiple prints. Needless to say this will avoid ruining your print if you accidentally hit X-SCARA while working.

The OpenBuilds mini heated bed can easily reach 100ºC, allowing you to build with materials like PET, PET-G, TPU.

Bill of materials

Screws and nuts

  • 6 x M3x12 screws (or M3x20)
  • 4 x M3x20 screws (or M3x30)
  • 4 x M3x25 screws (or M3x30)
  • 14 x M3 nuts (2.2mm thick)

Electronics

  • 1 x NTC 100k B3950 glass or metal thermistor
  • 1 x 100mm x 100mm heated bed (recommended OpenBuilds mini heated bed - check ooznest.co.uk)

Others

  • 4 x bed compression springs (OD 8mm, 20-25mm height)
  • aluminum/glass build plate 100 mm x 100 mm

Printed parts

Part Count Picture
Acc_FixedBedMount_Arm 1 sides
Acc_FixedBedMount_HeaterSupport 1 sides
Frame_Plate_TipConnector_FixedBedMount
(replaces Frame_Plate_TipConnector)		 1 ZHub 
Make sure you print the test part to check how your prints fit metal hardware.

Please note that the Frame_Plate_TipConnector_FixedBedMount replaces the Frame_Plate_TipConnector part from the frame set, to allow Acc_FixedBedMount_Arm part to connect to it via 4x M3x12 screws.

Assembly

Step 1 - Assemble the accessory

instructions

The assembly is pretty much straight forward:

  • place all M3 nuts at their designated places in Acc_FixedBedMount_HeaterSupport before starting assembly
  • connect the heater, the aluminum/glass build plate and the springs to the Acc_FixedBedMount_HeaterSupport part and screw in firmly
  • connect the Acc_FixedBedMount_Arm to the support you just assembled (follow the same instructions you used for building your frame here)
  • connect the modified Frame_Plate_TipConnector_FixedBedMount to your frame (replace the old Frame_Plate_TipConnector if necessary)
  • connect the arm to the new frame part

Step 2 - Firmware configuration

Just make sure your scara offset is set to 110 mm in Configuration.h:

 #define SCARA_OFFSET_Y    -110    // (mm)

For more details check the configuration guidelines.

Alternative mountings

In this set you also have a part called Acc_FixedBedMount_AlternativeArm.

This part is an alternative for connecting the Acc_FixedBedMount_HeaterSupport to the frame without requiring the replacement of any frame parts. It connects directly to the Frame_Plate_TipConnector part and stays secured via two screws that push on the plastic part when fastened.

The downside of this part is that is not as solid as this design and the bed can move up and down if hit. Check this video to see it in action.

Another alternative will be to screw Acc_FixedBedMount_HeaterSupport directly on a fixed surface, using M3 screws. The part provides multiple 3mm drills to allow you to fix it in place on wood or other surfaces.