Those "internal supports" have two names: The primary name is "skin" and it's also called "top layers". You can simply increase top layers. You can also make the skin *wider* - search for "skin" in the settings and you will instantly see a lot of settings - the only one that won't show up is "top layers".
You can also use "gradual infill" to make the infill density low or even zero for most of the part and then get more and more dense as you approach a side wall or top wall. I love this feature - it tends to reduce print time and weight by about 20% yet keep strength and good top layers/skin.
For starting out try:
infill density 50%
gradual infill steps 6
gradual infill step height 1mm (or less!)
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Job_van_gennip 23
Could you also share the model?
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