They look reasonably close to me. I have seen that much change printing the same part back to back.
This may be blasphemous in the Ultimaker forum, sorry everyone;
If you want the parts to match exactly, best way is to get 1 print you like, make a mold, and pour as many duplicates as you need. The mold needs to set overnight but you can pour a print every 20 minutes or so, with that one mold. Plastic of Different strength and flexibility's are available. You have to add the color yourself.
Back to PLA, the consistency between rolls has been giving me headaches. "Is it the PLA or is it my printer?" I am finding that each supplier has a consistency of its own.
The Ultimaker PLA is very good but getting it shipped to the USA is prohibitive in cost. Maybe someone knows a technique here for inexpensive shipping here that they could share.
Ultimachine is my favorite supplier so far in the states. All the PLA seems to print well and consistently from them.
My all time favorite is/was A2Aprinting from Canada. The layers stick together really well and there is great strength and flexibility in the printed piece. Unfortunately the shipping is nearly same as the cost of the plastic and their inventory goes Out of Stock.
These are just my opinions. I am not an engineer and don't print for profit.
I mean this next comment in the best way possible, your question is like "opening a can of worms" to use an old saying. You can follow many paths.
A piece can print quite differently depending on the slicing software you use. Search that one in the forums.
3d printing seems to have an unlimited amount of variables. These forums provide a wealth of information about these variables. Take that information and see what works best for you. Nothing is carved in stone, what works for one doesn't always work for the other.
These variables make answering the details of your question difficult. The environment in which your printer sits can effect the print noticeably for example.
To sum it up, your results look very good to me. Yes, to using the same roll of PLA if you want two prints to be as close as they can get. Second best is another roll from the same supplier ordered at the same time so they are from the same batch.
Here's hoping something from my opinions helps you
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illuminarti 18
It's hard to tell the difference between old and new, since the 'old' on is rather out of focus in your photo.
The new doesn't look too bad all things considered. but on the extreme left it looks like there's some underextrusion. It may well be that the new filament is a smaller diameter - have you measured it?
What speed, layer height and wall thickness are you printing at?
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