In addition to the 32 bit nano Black-N-Blue grbl, here is a list of upgrades.

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Upgraded 3 element Lens

There are lots of names for these lenses G2, G7, etc.. very little documentation comes with them

https://www.ebay.com/

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https://www.banggood.com/
 

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Silent drivers

TMC2208, TMC2209's are plug and play replacements of the A4988's that come stock with most controller.  TMC2100, TMC2130 need MS1, MS2 and MS3 pins clipped.

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0.9deg steppers

This requires steps/mm to change from 80steps/mm to 160steps/mm (2mm pitch belts with 20 tooth pulleys) 

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Company: OSM, PN:17HM150904S

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https://www.amazon.com/STEPPERONLINE-Stepper-Bipolar-42x42x39mm-4-wires/dp/B00W98OYE4/ref=sr_1_fkmr0_1?dchild=1&keywords=osmo+17hm150904s&qid=1596070131&sr=8-1-fkmr0

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https://www.ebay.com/itm/331603049921

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https://www.amazon.ca/0-9Degree-Stepper-Bipolar-42x42x39mm-Printer/dp/B074XPRYL2/ref=sr_1_fkmr0_1?dchild=1&keywords=osmo+17hm150904s&qid=1596069974&sr=8-1-fkmr0

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16 tooth pulley

This requires steps/mm to change from 160steps/mm with 0.9deg steppers to 200steps/mm

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Steel reinforced belts

https://www.ebay.com/itm/264394897500

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3D printed belt tensioners

https://www.thingiverse.com/thing:3996326

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Pulley couplers

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