Best cheap 2D laser frame

For working area 280x250:
M8 rod 405mm 4 ps
2020 Al 300mm 2ps
2020 Al 435mm 1ps
some screws M4 25mm, M6 30mm
some nuts M4, M8
12 ps 624zz Vtype +4mm grover 12ps
https://ru.aliexpress.com/item/50pcs-Lot-V624ZZ-624VV-4x13x6mm-V-Groove-Carbon-Steel-Deep-Groove-Ball-Bearing-Traces-Walking-Guide/32761541423.html
4ps M4 nuts for 2020
https://ru.aliexpress.com/item/50pcs-Free-shipping-2020-M3-M4-M5-hammer-t-nut-for-2020-Aluminum-Profile-SLOT-6/32820762035.html
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4.05.2018 Added laser holder for 32mm laser module like
LA03-2300 445nm 2300mW Blue Laser Module
https://www.banggood.com/EleksMaker-LA03-2300-445nm-2300mW-Blue-Laser-Module-2-2-54-2P-TTL-PWM-Modulation-for-DIY-Laser-Engraver-p-1105563.html
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Motor mount added
https://www.thingiverse.com/thing:2991564