Signs of elephant foot:
You’ll see a flared out 1st layer, making our parts too big. Followed by a concave indentation of the next few lines before things straighten out as the heat radiating from the heat bed diminishes. As shown in the image.
Explanation:
The heat from the bed tends to be too much for the filament causing it to flare out. As the print continues higher and the heat from the bed diminishes the print, prints normally.
How to fix:
Increase the part cooling fans. If you’re not using 100% part cooling lower the bed temperature. Make sure you’re within the heated bed temperature range advertised by the manufacturer. The highest point in the range should never exceed 10°C below the glass transition temperature (rigid.ink Tg are available in the downloadable datasheets in the settings tab on product pages).
Increase the nozzle to bed distance slightly. If you’re already at the lower end of the heated bed temperature range, you can try increasing the nozzle to bed distance slightly.