When the assembly of the Ultimaker Original+ is complete, first check the positions of the limit switches. The limit switches, or end stops, set the Home positions of the print head and build plate. Due to tolerances in the parts, the wood, and the assembly, it is recommended to first perform a manual check before you turn on the printer for the first time.
During assembly, the switches were placed as far toward the inside of the printer as possible. This gives the highest chance that the switches will be correctly activated.
Place the print head in the center of the printer. Gently move it manually all the way to the front. Check that the Y limit switch (with the red wire, in the left panel) is activated before the print head hits the frame. You should hear a clear clicking sound.
Next, move the print head to the left to check the X limit switch (with the blue wire, in the front panel). Perform the same check.
When the switches are not activated, loosen the bolts and place them further toward the inside of the printer. If this is not possible, you can carefully bend the switch's lever somewhat.
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| Manually move the print head to the Home position in the front-left corner | Adjust the switches' positions by loosening and retightening the bolts |
During assembly, the bolts of the Z limit switch were not fully tightened. The position of the Z limit switch must be fine-tuned when the assembly of the printer is completely finished and before turning on the Ultimaker Original+ for the first time.
Follow the steps below to ensure you place the Z limit switch correctly:
| Check the build plate | Ensure that there is approximately 10 mm distance between the top of the base plate and the bottom of the heated bed. Also make sure that the glass plate is installed. |
| Move the Z switch | Check that you can move the Z limit switch up and down. If this is not or barely possible because there is too much friction, slightly loosen the 2 bolts in the back panel. |
| Position the print head | Place the print head approximately in the center of the machine. This prevents inaccuracies due to an incorrectly leveled build plate (this will be done later). |
| Raise the build plate | Manually raise the build plate until there is approximately 1 mm distance between the tip of the nozzle and the glass build plate. Keep the plate in position. |
| Adjust the Z limit switch | Move the Z limit switch in the back panel until the switch is pressed by the wooden cap of the Z stage. You should hear a clicking sound. When it is in the correct position, firmly tighten the two bolts of the limit switch. |
| Checks | Ensure the switch is placed straight and it can no longer move. Lower the build plate slightly and then move it up again. Check if the Z switch is activated when there is approximately 1 mm between the nozzle and the build plate. If not, perform the steps above again. |
When you are satisfied with the positions of all three of the limit switches, the assembly process is really complete! You can now turn on the Ultimaker Original+ for the first time. Prepare the printer for your first print by loading material, setting up the Ultimaker Original+ in Cura, and leveling the build plate.
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