CoreOne INDX Spool Mount Back Plate

Description

Designed to improve the installation of the INDX spool holders and the reattachment of the Core One side panels. You can use a magnet to hold the back plate in place while reinstalling the panels and then remove the magnet for further use. The supplied tool is not an ideal long term solution.

Features

• Easy, short print time. (~7 min)

• Supplied nuts fit tightly (M3nN)

• Hold in place with a spare/extra magnet that Prusa supplied for the original build. You can also harvest one from the old filament sensor that you are replacing.

• The side panels are easier to remove and reinstall for maintenance and possible upgrades.

• Universal fit for all top mounts. (No front, back, left or right)

Print Settings 

• Material: Prusament ASA

• Nozzle: 0.4mm @265°C

• Bed: Satin @ 110°C

• Layer Height: .2mm 

• Max Volumetric Speed/Flow: 26mm³/s

• Infill: 100% infill 

• Brim: 5mm

• Supports: NA

• Prusa presets

***CAUTION***

• REMOVE THE MAGNET AFTER INSTALLATION IS COMPLETE. It is only meant as an aid

• DO NOT ALLOW SCREWS TO STICK OUT PAST THE NUTS/BACK PLATE

• TRIPLE CHECK THAT THE BACK PLATE, NUTS AND SCREWS DO NOT INTERFEAR WITH THE Z AXIS MOUNTS!

  • The back plates fit with plenty of clearance for my Core One that was kit built in early 2026

  • The machine would likely trigger an overload and stop the Z axis if interference happens but do not rely on that.

• Install the nuts so that the nylon locking side is facing towards you. The screws enter from the "bottom" when installing.

Updates

• v1.1 is sized to work with ASA/ABS. 

• Adjusted pocket that hold the nuts to fit better when using ASA/ABS

• Removed v1.0 as it did not fit well with ASA/ABS

Back Story

While upgrading my Core One + to the INDX version I came to a stop when following the instructions for attaching the new spool holders and side panel. It is a pain to do even when using the supplied tool and I thought there has to be a better way, AND THERE IS!

I highly recommend printing these top backplate before beginning your upgrade.  I did not because like many of you, I had no clue this part of the install would not be as polished as the rest and found myself looking for a solution after installing one side. 

I am open to testing various materials including CF or GF filled materials although they are likely overkill. I have some PA6CF but have confirmed fitment with Prusament ASA.

I did not design anything for the bottom mounts as there is only 1 nut per spool holder that is on the inside of the printer. The others are below or screw into a threaded hole. If I receive enough requests, I will design and test one.

Thank you for visiting my page! If you enjoyed this model, your likes and ratings are greatly appreciated and help support future creations.

Products

• CoreOne+

• CoreOne+ Ultimate

• MK4

• Polymaker PolyDryer Box

• Polymaker ASA (my other favorite)

Disclaimer:

• Links may take you to Amazon or Prusa.com for products I endorse and use on a regular basis.

• JD3D is not responsible for any damage or harm caused by improper production, assembly and use. 

• All images of Printed parts are real but may have some lighting or color correction.