SLA vs. FDM： Differences and Comparison

FDM printers can have significantly larger build volumes, whereas SLA printers have much better resolution.

SLA vs. FDM: Technology Comparison

SLA and FDM technologies are not directly comparable. Each printer employs a fundamentally different technology and different materials. FDM technology is significantly simpler. It can be assembled by anyone with basic technical skills. However, SLA machines require specialized knowledge and tools to assemble. SLA makes use of a laser to solidify the part, whereas FDM simply allows the plastic to solidify through natural cooling.

SLA vs. FDM: Material Comparison

SLA resin is provided in liquid form. In general, the materials are relatively proprietary and cannot be exchanged between printers. Very few colors are available, and the material range is limited. FDM material is far more common and comes in any color. It also has fillers like carbon fiber to improve part strength. Most FDM machines can easily accept filaments from different suppliers.

SLA vs. FDM: Product Applications Comparison

SLA is suited to applications that need very fine detail while also not needing exceptional mechanical strength. These applications can include: jewelry patterns for molding, display figurines, and visual prototypes.

FDM is typically used by hobbyists and professionals to print functional and non-functional plastic parts. FDM materials offer more strength and the material properties cover a wide spectrum. Typical applications can include: jigs, brackets, and functional prototypes.

SLA vs. FDM: Print Volume Comparison

FDM printers have a wide range of build volumes, from as small as desktop printers to printers with a build volume of up to a cubic meter. SLA however has smaller build volumes due to the need to keep liquid photopolymer resin stored in the printer. 

SLA vs. FDM: Surface Finish Comparison

SLA produces excellent surface finishes that are significantly better than those possible with FDM printing. FDM parts have visible layer lines that need to be removed with sanding or vapor smoothing, which is only possible with some materials. 

SLA vs. FDM: Cost Comparison

SLA is significantly more expensive than FDM. This is due to the specialized nature of the photopolymers used in SLA. The high-precision UV laser required to print parts with the quality SLA is known for also adds to the cost. FDM printers can be bought for as little as $200 whereas an entry-level SLA printer can cost at least $1,295.