[Kevan]

Kev (OXO) & Greg (MrF) have both made versions for their tyre truers...I have a RSM3 truer which is different again so used the files Greg kindly provided and modified it.

This remix uses Slot car round magnets we normally stick together and never use, the 8mm diameter ones push into the 'magnet joint' and 'magnet short arm'.  I made the 'magnet joint' 6mm thicker to centralise the sliding plate, in the video you can see the temporary mod I made with two pieces of 3mm thick expanded foam.
If you print two 'magnet joints' you can spin the slider round and use fresh sandpaper.

The RSM 3 truer should be a snug fir into the 'RSM base unit' and can be secure in place with two 'roller' discs but may not be necessary if the truer is snug enough.

The 'gantry' is a snug fit over the 'RSM base unit', again two 'roller' discs can be held down with screws but again may not be necessary if the fit is snug enough.

The 'motor arm' slides onto the shaft of the reciprocator motor. The motor I used is a
'Geared Micro Motor Speed Reduction Gearbox - 12V ⋅ 30 RPM'

I soldered wires from the reciprocator motor to the truer motor and run it at 4v.  (5v seems to work better for super soft tyres like Scaleauto A-S25's and SlotIt G25's)

HERE on thingiverse

[MrFlippant]

Yay! 
Any interest in making those for people like I do? I won't, if only because I don't have the RSM to ensure my prints function properly, but I'll bet there are some people out there who have that machine, but do not have access to a 3D printer, and would love to have the reciprocator.

[Kevan]

I hadn't considered it but never say never. 

There's a couple of tweaks I'd like to do, one of which is fit a 'magnet joint' to the other end of the slider plate so it can be used either way round and therefore fresh sections of the wet'n'dry paper.

Also the roller washers will be modified to sit just over the top edge of the slider plate to prevent it lifting, they will also be eccentric so you can set the roller as close to the slider as you wish.

[Kevan]

I hadn't considered it but never say never. 

There's a couple of tweaks I'd like to do, one of which is fit a 'magnet joint' to the other end of the slider plate so it can be used either way round and therefore fresh sections of the wet'n'dry paper.

Also the roller washers will be modified to sit just over the top edge of the slider plate to prevent it lifting, they will also be eccentric so you can set the roller as close to the slider as you wish.

Those mods are done and work brill!

[MrFlippant]

Cool! I'm looking forward to downloading the updated files to check them out. :)

[Kevan]

I just uploaded the eccentric roller/washers, give it a few mins to update.

[Kevan]

...a few more mins... 

[MrFlippant]

Looks good. So you just use those instead of the plain discs on the front, rotate them until the sanding plate moves sideways but not forward and back, and then snug them down?

[Kevan]

Yep, takes all the slop out of the slider 

[Kevan]

A magnet joint at each end of the slider works great too