Be conservative, but there is absolutely tons of speed to be gained for the experienced user. Newbies need to stay slow and steady.
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Got strut plates cut today! And I tried my hand at an engraving with a v-bit. Came out pretty decent. I guess I should start making the youtube videos now lol.
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I don’t believe it. I need pictures…or a video. 
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(working from memory here, so take comments with a grain of salt)
I recall reading that every possible byte of memory on the Uno was used for grbl, so I don’t think there’s room there to run Marlin, This is also why there isn’t room for things like displays on the Uno.
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I don’t believe there is enough IO and there is only one serial port as well.
Marlin can be an accordion, because all of the configuration is with macros. You can turn a ton of the code off and it gets a lot smaller.
I have interest in finding out if I can make it fit though. I doubt it would be worth it.
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I am using a mega2560 and its less than half the memory I believe. Not exactly sure how the UNO and the mega stack up against each other but I wanted more pins for future expansion. I was able to flash Marlin on to it as well, but I haven’t gotten familiar with Marlin much yet. I still need to read through the code a bit more. When I flashed it I couldn’t get any motion initially so I must have had something set up incorrectly, so for the time being at least I just went back to GRBL. There are definitely alot of things about Marlin that I wish GRBL had, but there are alot of forks of GRBL on github that have a variety of feature implemented. I think with some patience and alot of trial and error and reading code, I should be able to get all the features I want into one piece of GRBL firmware. But I still may yet switch to Marlin. If however I get GRBL working in much the same way I’ll be sure to make my own repository and share it here for a Lowrider 3 specific version others can try out if they like.
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Finally got blendercam working. That was the hardest thing to install I’ve ever come across. Hopefully it was worth the effort.
Looking good! Like your colors!