ALCA5 Heated Bed Replacement

Tools

• Flush Cutters

• 4mm, 6mm Hex

• 10mm, 19mm Wrench

Step 1: Lower Bed and Power Off Machine

• Using the front screen navigate to actions > move and press Z- to lower the bed to Z150.

• You can then shut the machine off by going to config > system > shutdown > printer. Move the power switch at the back of the machine to the off position.

Step 2: Remove Bed Fastener

• Using a 4mm hex and 10mm socket remove the three M6x75mm countersunk screws holding down the bed. Set this hardware in a safe place as we will be reusing them.

Open

Step 3: Unplug Connectors

• Unplug the heater and temperature connectors located at the rear-left of the spider plate. Take note of the release tabs shown below:

Open

Step 4: Replace Bed

• Now that the old bed is free, you can proceed to swap it out with the new one. Take note of the 3 locating features on the ALCA5 plate. There is a slot, point, and planar surface that should mate with the corresponding ball point set screws on the spider plate.

Step 5: Reinstall Hardware

• Insert the M6x75mm countersunk screws into each of the three holes.

• Reinstall the washers, spring perches, spring, and nylock nut in the correct sequence according to the diagram.

• Torque the nylock nut until there is one full thread exposed on the end of the M6 screw.

Step 6: Reconnect Connectors

• Reconnect the bed heater and temperature wires.

• Power the machine back on.

Step 7: Check Bed Calibration

• Connect to the web interface

• Set the bed height

  1. Place a clean spring steel build sheet on the aluminum bed plate, do not use a textured sheet.

  2. Home the machine

  3. Probe the points over the kinematic mounts by entering the following command in the Console:

     _PROBE_KINEMATIC_POINTS

  4. Alternately you can use the following commands to probe a single point:

     _PROBE_KINEMATIC_POINT_1 _PROBE_KINEMATIC_POINT_2 _PROBE_KINEMATIC_POINT_3

  5. Adjust the three M12 ballpoint set screws that comprise the kinematic mounts on the underside of the bed supporting plate until all 3 probe points are at +/- 0.030mm. Do not adjust the tension springs.

  6. Tighten the locknuts with a 19mm wrench and check again.

  7. If needed, the kinematic mounts can be adjusted by as much as 0.040mm with the nuts tightened