3DPrinting

Pointy corners like to lift. Try designing with a small radius if possible. A brim helps a lot. Also print so that the long edge of the part is on the X axis for bed slingers.

This is an example I am currently printing with a 10mm brim:

The biggest issue is that your corners are lifting from the bed during the print. Fixing this is usually a combination of making sure the bed is clean and adding a brim to increase adhesion. Maybe messing with temperature and cooling fan settings for the first few layers.

Second is things look a bit over extruded. This could just be due to the corner issue though so fix that before any other changes.

Great comments, but Id like to add bit more.

Start with calibration if you havent already:

1. e-steps calibration - do it once after any hardware change
2. Temperature tower - every filament is different
3. Flow tower - do it every time you notice extrusion issues after changing filament
4. First layer calibration (bed leveling and nozzle distance) - you obviously did that, but look if there is any room for improvement
5. Retraction calibration - not relevant for this model, but thats the last part of basic calibration

On top of that, you want to improve 1st layer adhesion to avoid lifting:

1. Use brim
2. Add more squish (reduce nozzle to bed distance)
3. Print first layer slowly
4. Clean your bed and dont touch it with fingers
5. Use round corners when possible
6. Dont use part cooling fan on first layer
7. Leave bed heater on for some time before you start printing (to give enough time for build plate to heat up evenly)
8. Lower bed temp after first layer (example: I print PLA on clean glass at 60C, but after first layer I drop it to 55C)
9. Use mouse ears (basically a fat brim that you place manually on sharp corners)

Use glue or hairspray if nothing else helps, or consider better build plate like PEI or even better quality filament

Other recommendations are great but you could also try some type of adhesive AFTER you've eliminated any other potential problem sources.

It does look a over extruded. Have you calibrated your esteps? I always need to do that when changing filament types and sometimes even between rolls of the same filament type (especially bargain bin PLA from amzn)

My ender 3 with a textured glass bed sticks perfect with PLA and nothing else. For some reason PLA+ tends to lift. Glue stick helped with PLA+ but I hated dealing with because it REALLY stuck so I switched to masking tape. That does the job and is easier to remove. On my CR-10 with plain glass bed (no texture) I use hairspray... Mostly because that's what the guy I bought it from recommended and, to be honest, it does work amazingly. Nothing sticks to that glass plate bed without an adhesive but it pops right off once the bed cools down.

That said, I don't recommend "extra" adhesives unless you're fully sure you've solved any other potential problems. They can be a help/bandaid but if the root cause is something else then you're just masking it.

Some materials and beds need some help, some don't. I primarily use PLA and PLA+ with the occasional PETG and TPU.