=Introduction=
=Challenges=
=Approaches= * using frames as rails with linear bearings * [https://www.aliexpress.com/item/1005001264680460.html HGR15 HGR20 HGR25 Square Linear Guide Rail 2pc+4pcs HGH20CA/HGW20CC HGH15CA Flang Slide Block Carriages For CNC Router Engraving]
{| class=“wikitable”
! HG series !! Hardware !! Dimensions !! Source
HGR15 | M4 | ||||
HGR20 | M5 | ||||
HGR25 | ? | ||||
=References=