Grooved Linear Bearing

This is a printable, grooved version of the 1/4" Linear Bearing used on the cupcake CNC. ABS isn't an ideal bearing material for several reasons, but I think it should be ok for light duty applications if properly lubed (hence the grooves), and you can always print a replacement. Alternatively you could use HDPE or UHMWPE (which melts at about 300F); I've attached a non-grooved version just in case.

Notes:
1) Should print ok, but I haven't tried it.
2) ID as shown is slightly undersized -